There are various pronunciations for 'the' based on the context.
1. Textbooks, dictionaries, church, theaters: [ð?] + C, [ði] + V 2. In AmE, the distinction is not preserved among many speakers: [ð?] + C/V 3. If 'the' is not stressed, it can be /?/ before consonants. 4. [ð] + V in conversational tempos 5. [ð?] + most vowels in slow tempos 6. [ði] + /?/ in slow t